US4842392A - Objective lens driving unit - Google Patents
Objective lens driving unit Download PDFInfo
- Publication number
- US4842392A US4842392A US07/052,922 US5292287A US4842392A US 4842392 A US4842392 A US 4842392A US 5292287 A US5292287 A US 5292287A US 4842392 A US4842392 A US 4842392A
- Authority
- US
- United States
- Prior art keywords
- objective lens
- bobbin
- driving unit
- magnetic
- magnetic yoke
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Images
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
- G11B7/09—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
- G11B7/0925—Electromechanical actuators for lens positioning
- G11B7/093—Electromechanical actuators for lens positioning for focusing and tracking
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
- G11B7/09—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
Definitions
- the present invention relates to objective lens driving unit, and more particularly to an electromagnetic driving unit for driving objective lens of an optical pick-up which emits light beam on an optical disk recorded with high density digital signal and read optical information of reflected light from the disk.
- the bobbin 4 is held movably in the focusing and tracking directions by flexible holders 16.
- An objective lens 5 mounted in a metallic lens barrel 5' is held in the bobbin 4, so that the objective lens 5 is driven in either of the focusing movement direction or in the tracking direction.
- a closed magnetic circuit structure is constituted by forming a pair of yoke wings 7a and 7b on the magnetic yoke 2, and by inserting them in respective hollows 6a and 6b of the bobbin 4.
- the above-mentioned conventional construction has such problems that the provision of the hollows 6a and 6b increases size of the bobbin 4, and hence the total length of the focus drive coil 3a thereby inducing increase of weight of the moving parts. Furthermore, since the tracking drive coils 3b and 3c must be formed in a configuration of having no core for winding therein, they need many steps of works in bonding them to the bobbin 4. Besides, the increase of the focus-drive coil 3a induces undue increase of coil resistance. As a result of the above-mentioned problems, size of the conventional objective lens driving unit can not be miniaturized, nor cost thereof can be sufficiently low.
- the object of the present invention is to provide an improved objective lens driving unit having miniaturized size and low manufacturing cost.
- the objective lens driving unit in accordance with the present invention comprises:
- a movable bobbin having an objective lens fixed thereto, a focus drive coil wound thereon, and tracking drive coils wound thereon with its axial direction perpendicular to the axial direction of the focus drive coil, and
- a magnetic circuit having at least one permanent magnet and a magnetic yoke for forming a magnetic flux to cross the focus drive coil and the tracking drive coil.
- the unit in accordance with the present invention has the following advantages:
- Moving part consisting of the coil bobbin, coils wound thereon and the objective lens are of small size and light-weight, thereby enabling miniaturization of the whole objective lens driving unit.
- FIG. 1(A) is a perspective view showing an embodiment of an objective lens driving unit for an optical pick-up in accordance with the present invention.
- FIG. 1(B) is a cross-sectional view sectioned by a plane which includes an axis of an objective lens (12) and is in parallel with line A--A' in FIG. 1(A).
- FIG. 2(A) is a perspective view showing another embodiment of an objective lens driving unit for an optical pick-up in accordance with the present invention.
- FIG. 2(B) is a cross-sectional view sectioned by a plane which includes an axis of an objective lens (12) and is in parallel with line A--A' in FIG. 2(A).
- FIG. 2(C) is a cross-sectional view sectioned by a plane which includes a focus drive coil (13a) and is in parallel with line B--B' in FIG. 2(A).
- FIG. 3(A) is a plan view showing an open magnetic circuit.
- FIG. 3(B) is a plan view showing an open magnetic circuit of an embodiment of an objective lens driving unit for an optical pick-up in accordance with the present invention.
- FIG. 4(A) is the perspective view showing the conventional objective lens driving unit for an optical pick-up
- FIG. 4(B) is the cross-sectional view sectioned by a plane which includes an axis of an objective lens (5) and is in parallel with line A--A' in FIG. 4(A).
- an objective lens 12 is fixed to a bobbin 11, a focus drive coil 13a is wound on the bobbin 11 in a coaxial relation with the axis of the objective lens 12, and two tracking drive coils 13b and 13c are wound on the bobbin 11 with their axial direction perpendicular to the axis of the objective lens 12, in order to drive the objective lens in directions of focusing and tracking, respectively.
- the bobbin 11 is held movably in the focusing and tracking directions by flexible holders 16.
- a magnetic yoke 14 has a substantially U-shaped configuration, and the bobbin 11 is put between both side elevation members 14a, 14b of the magnetic yoke 14.
- a pair of permanent magnets 15a and 15b are fixed to the magnetic yoke 4 so as to face the bobbin 11, thereby to form a magnetic circuit together with the magnetic yoke 14.
- the permanent magnetic 15a and 15b and the magnetic yoke 14 are not disposed inside the bobbin 11 but disposed only outside a moving space of the bobbin 11.
- This structure requires no apertures to receive the magnetic yoke wings inside the bobbin 11 unlike the prior art and enables to make the bobbin 11 small.
- ineffective part of a focus driving coil 13a can be shortened, and thereby coil resistance is reduced and weight of the coil is decreased. Therefore, the whole weight of moving parts can be decreased by miniaturizing the bobbin 11.
- steps in manufacture in winding and assembling are reduced in comparison with those of conventional coil having no core for winding therein.
- this embodiment enables the objective lens driving unit to make not only small size but also low cost.
- an objective lens 12 is fixed to a bobbin 11
- a focus drive coil 13a is wound on the bobbin 11 in a coaxial relation with the axis of the objective lens 12
- two tracking drive coils 13b and 13c are wound on the bobbin 11 with their axial direction perpendicular to the axis of the objective lens 12, in order to drive the objective lens in directions of focusing and tracking, respectively.
- the bobbin 11 is held movably in the focusing and tracking directions by flexible holders 16.
- a magnetic yoke 17 consisting of four peripheral parts 17a and 17b and 17c and 17d is formed in a rectangle to surround the bobbin 11, hence to loop magnetic circuit, on a perpendicular surface to an optical axis of the objective lens 12. Permanent magnetic 15a and 15b are fixed to the magnetic yoke 17 so as to face the bobbin 11.
- FIG. 3(B) a magnetic circuit of this embodiment as shown FIG. 3(B) has a lower magnetic reluctance, hence a higher efficiency, than a completely open magnetic circuit shown in FIG. 3(A). Further, because of drastically reduced weight, motion of the moving parts becomes much more sensitive than the prior art and thereby, the efficiency lowering of the magnetic circuit due to omission of the internal yoke is sufficiently overcome.
- This embodiment also has an advantage against the prior art that the whole of the objective lens driving unit can be miniaturized, as a result of miniaturization of the bobbin 11 and the coil 13a.
- the magnetic fluxes generated by magnets 15a and 15b form a closed magnetic circuit within the magnetic yoke 17 which is disposed to surround the bobbin 11. Therefore, a high magnetic flux density which traverses the coils 13a and 13b and 13c can be obtained in comparison with some prior art having no magnetic yoke and for instance the first embodiment having the magnetic yoke under the bobbin 11, and thereby an efficiency of magnetic circuit is improved.
Abstract
Description
Claims (4)
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP61-120538 | 1986-05-26 | ||
JP61-120539 | 1986-05-26 | ||
JP12053886A JPS62277637A (en) | 1986-05-26 | 1986-05-26 | Objective lens driver |
JP12053986A JPS62277638A (en) | 1986-05-26 | 1986-05-26 | Objective lens driver |
Publications (1)
Publication Number | Publication Date |
---|---|
US4842392A true US4842392A (en) | 1989-06-27 |
Family
ID=26458102
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US07/052,922 Expired - Lifetime US4842392A (en) | 1986-05-26 | 1987-05-22 | Objective lens driving unit |
Country Status (3)
Country | Link |
---|---|
US (1) | US4842392A (en) |
KR (1) | KR910001634B1 (en) |
BR (1) | BR8702669A (en) |
Cited By (23)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4991161A (en) * | 1988-03-29 | 1991-02-05 | Olympus Optical Co., Ltd. | Apparatus for supporting objective lens movably in two orthogonal directions |
US5043972A (en) * | 1988-08-15 | 1991-08-27 | Pioneer Electronic Corporation | Optical component-driving device for optical pickup |
US5107372A (en) * | 1989-09-06 | 1992-04-21 | Daniel Gelbart | Focus servo actuator for moving lens scanners |
US5124965A (en) * | 1989-09-28 | 1992-06-23 | Matsushita Electric Industrial Co., Ltd. | Optical head supporting apparatus |
US5150343A (en) * | 1989-07-19 | 1992-09-22 | Matsushita Electric Industrial Co., Ltd. | Miniaturized low-power-consumption optical head provided with a state transformation mechanism |
US5177640A (en) * | 1991-10-08 | 1993-01-05 | Applied Magnetics Corporation | Two-axis moving coil actuator |
US5265079A (en) * | 1991-02-15 | 1993-11-23 | Applied Magnetics Corporation | Seek actuator for optical recording |
EP0700036A1 (en) * | 1994-08-31 | 1996-03-06 | Pioneer Electronic Corporation | Optical pickup for an optical disc player |
US5640280A (en) * | 1994-11-17 | 1997-06-17 | Daewoo Electronics Co., Ltd. | Objective lens driving device for an optical pickup |
US5677899A (en) | 1991-02-15 | 1997-10-14 | Discovision Associates | Method for moving carriage assembly from initial position to target position relative to storage medium |
US5729511A (en) | 1991-02-15 | 1998-03-17 | Discovision Associates | Optical disc system having servo motor and servo error detection assembly operated relative to monitored quad sum signal |
US5748578A (en) | 1995-01-25 | 1998-05-05 | Discovision Associates | Colpitts type oscillator having reduced ringing and improved optical disc system utilizing same |
US5808980A (en) | 1991-02-15 | 1998-09-15 | Discovision Associates | Seek actuator for optical recording |
US5920539A (en) | 1995-01-25 | 1999-07-06 | Discovision Associates | Apparatus and method for suppression of electromagnetic emissions having a groove on an external surface for passing an electrical conductor |
US6069857A (en) | 1991-02-15 | 2000-05-30 | Discovision Associates | Optical disc system having improved circuitry for performing blank sector check on readable disc |
US6091684A (en) | 1995-01-25 | 2000-07-18 | Discovision Associates | Optical disc system and method for changing the rotational rate of an information storage medium |
US6141300A (en) | 1989-06-20 | 2000-10-31 | Discovision Associates | Optical actuator including lens assembly with optical axis having symmetric suspensory forces acting thereon and optical disc system including same |
EP1079377A2 (en) * | 1999-08-24 | 2001-02-28 | Pioneer Corporation | Lens driving apparatus for disk player |
US6236625B1 (en) | 1991-02-15 | 2001-05-22 | Discovision Associates | Optical disc system having current monitoring circuit with controller for laser driver and method for operating same |
US6434087B1 (en) | 1995-01-25 | 2002-08-13 | Discovision Associates | Optical disc system and method for controlling bias coil and light source to process information on a storage medium |
US6654185B1 (en) * | 2000-11-14 | 2003-11-25 | Acute Applied Technologies Inc. | Electromagnetic actuator having specific coil arrangement for improving utilization rate of magnetic circuit thereof |
US20050105408A1 (en) * | 2001-12-01 | 2005-05-19 | Samsung Electronics Co., Ltd. | Actuator used with an optical pickup |
CN110678803A (en) * | 2017-05-26 | 2020-01-10 | Lg伊诺特有限公司 | Lens driving device, and camera module and optical apparatus including the same |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2159293A (en) * | 1984-04-23 | 1985-11-27 | Pioneer Electronic Corp | Lens driving device for an optical pickup |
GB2161955A (en) * | 1984-07-13 | 1986-01-22 | Pioneer Electronic Corp | Objective lens drive and support structure |
US4669823A (en) * | 1983-10-31 | 1987-06-02 | Hitachi, Ltd. | Optical system drive for optical recording/reproducing apparatus |
-
1987
- 1987-05-22 US US07/052,922 patent/US4842392A/en not_active Expired - Lifetime
- 1987-05-25 KR KR1019870005148A patent/KR910001634B1/en not_active IP Right Cessation
- 1987-05-25 BR BR8702669A patent/BR8702669A/en not_active IP Right Cessation
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4669823A (en) * | 1983-10-31 | 1987-06-02 | Hitachi, Ltd. | Optical system drive for optical recording/reproducing apparatus |
GB2159293A (en) * | 1984-04-23 | 1985-11-27 | Pioneer Electronic Corp | Lens driving device for an optical pickup |
GB2161955A (en) * | 1984-07-13 | 1986-01-22 | Pioneer Electronic Corp | Objective lens drive and support structure |
Non-Patent Citations (2)
Title |
---|
EP0092997, 11 1983, Kido. * |
EP0092997, 11-1983, Kido. |
Cited By (43)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4991161A (en) * | 1988-03-29 | 1991-02-05 | Olympus Optical Co., Ltd. | Apparatus for supporting objective lens movably in two orthogonal directions |
US5043972A (en) * | 1988-08-15 | 1991-08-27 | Pioneer Electronic Corporation | Optical component-driving device for optical pickup |
US6141300A (en) | 1989-06-20 | 2000-10-31 | Discovision Associates | Optical actuator including lens assembly with optical axis having symmetric suspensory forces acting thereon and optical disc system including same |
US5150343A (en) * | 1989-07-19 | 1992-09-22 | Matsushita Electric Industrial Co., Ltd. | Miniaturized low-power-consumption optical head provided with a state transformation mechanism |
US5107372A (en) * | 1989-09-06 | 1992-04-21 | Daniel Gelbart | Focus servo actuator for moving lens scanners |
US5124965A (en) * | 1989-09-28 | 1992-06-23 | Matsushita Electric Industrial Co., Ltd. | Optical head supporting apparatus |
US6532199B1 (en) | 1991-02-15 | 2003-03-11 | Discovision Associates | Optical actuator assembly with lens position sensor for recording or playback |
US5677899A (en) | 1991-02-15 | 1997-10-14 | Discovision Associates | Method for moving carriage assembly from initial position to target position relative to storage medium |
US5729511A (en) | 1991-02-15 | 1998-03-17 | Discovision Associates | Optical disc system having servo motor and servo error detection assembly operated relative to monitored quad sum signal |
US5265079A (en) * | 1991-02-15 | 1993-11-23 | Applied Magnetics Corporation | Seek actuator for optical recording |
US5808980A (en) | 1991-02-15 | 1998-09-15 | Discovision Associates | Seek actuator for optical recording |
US6236625B1 (en) | 1991-02-15 | 2001-05-22 | Discovision Associates | Optical disc system having current monitoring circuit with controller for laser driver and method for operating same |
US6069857A (en) | 1991-02-15 | 2000-05-30 | Discovision Associates | Optical disc system having improved circuitry for performing blank sector check on readable disc |
US5177640A (en) * | 1991-10-08 | 1993-01-05 | Applied Magnetics Corporation | Two-axis moving coil actuator |
EP0700036A1 (en) * | 1994-08-31 | 1996-03-06 | Pioneer Electronic Corporation | Optical pickup for an optical disc player |
US5663841A (en) * | 1994-08-31 | 1997-09-02 | Pioneer Electronic Corporation | Optical pickup device having a magnetic circuit whose poles are configured along a common path within one pole within a focus coil |
US5640280A (en) * | 1994-11-17 | 1997-06-17 | Daewoo Electronics Co., Ltd. | Objective lens driving device for an optical pickup |
CN1080914C (en) * | 1994-11-17 | 2002-03-13 | 大宇电子株式会社 | Objective lens driving device for optical pickup |
US6034364A (en) | 1995-01-25 | 2000-03-07 | Discovision Associates | Optical disc system including focus capture assembly with focus error signal circuit and method for operating same |
US6317391B1 (en) | 1995-01-25 | 2001-11-13 | Discovision Associates | Optical disc system having current monitoring circuit with improved bias coil assembly and controller for laser driver and method for operating same |
US5920539A (en) | 1995-01-25 | 1999-07-06 | Discovision Associates | Apparatus and method for suppression of electromagnetic emissions having a groove on an external surface for passing an electrical conductor |
US6058081A (en) | 1995-01-25 | 2000-05-02 | Discovision Associates | Optical drive system having servomotor operated relative to maximum quad sum signal |
US5878015A (en) | 1995-01-25 | 1999-03-02 | Discovision Associates | Laser driver for controlling electrical current passed to a laser in an optical disc system |
US6087644A (en) | 1995-01-25 | 2000-07-11 | Discovision Associates | Focus capture for optical disc system including detection of quad sum signal to close focus |
US6091684A (en) | 1995-01-25 | 2000-07-18 | Discovision Associates | Optical disc system and method for changing the rotational rate of an information storage medium |
US5875158A (en) | 1995-01-25 | 1999-02-23 | Discovision Associates | Servo control system for information storage device |
US6741529B1 (en) | 1995-01-25 | 2004-05-25 | Discovision Associates | Method and apparatus for moving carriage assembly from initial position to target position and optical disc system including same |
US5828054A (en) | 1995-01-25 | 1998-10-27 | Discovision Associates | Focusing method and system for focus capture and focus control in optical disc system including detection of Quad Sum signal to close focus |
US6243336B1 (en) | 1995-01-25 | 2001-06-05 | Discovision Associates | Optical disc system having servo motor and servo error detection assembly operated relative to monitored quad sum signal and focus capture method for use in same |
US6266306B1 (en) | 1995-01-25 | 2001-07-24 | Discovision Associates | Analog to digital converter and assembly for use in optical drive system to normalize servo error signals and multiplex reference voltage inputs and digital outputs |
US6278665B1 (en) | 1995-01-25 | 2001-08-21 | Discovision Associates | Optical disc system including current monitoring circuit assembly having controller with improved optics module and laser driver and method for operating same |
US5974007A (en) | 1995-01-25 | 1999-10-26 | Discovision Associates | Apparatus for moving a carriage assembly from an initial position to a target position |
US5796703A (en) | 1995-01-25 | 1998-08-18 | Discovision Associates | Apparatus for controlling an electrical current passed to a writing device in an optical storage system |
US6418097B1 (en) | 1995-01-25 | 2002-07-09 | Discovision Associates | Analog to digital converter assembly for normalizing servo error signals and multiplexing reference voltage inputs and digital outputs and improved optical drive system including same |
US6434087B1 (en) | 1995-01-25 | 2002-08-13 | Discovision Associates | Optical disc system and method for controlling bias coil and light source to process information on a storage medium |
US5748578A (en) | 1995-01-25 | 1998-05-05 | Discovision Associates | Colpitts type oscillator having reduced ringing and improved optical disc system utilizing same |
EP1079377A3 (en) * | 1999-08-24 | 2003-05-07 | Pioneer Corporation | Lens driving apparatus for disk player |
EP1079377A2 (en) * | 1999-08-24 | 2001-02-28 | Pioneer Corporation | Lens driving apparatus for disk player |
US6654185B1 (en) * | 2000-11-14 | 2003-11-25 | Acute Applied Technologies Inc. | Electromagnetic actuator having specific coil arrangement for improving utilization rate of magnetic circuit thereof |
US20050105408A1 (en) * | 2001-12-01 | 2005-05-19 | Samsung Electronics Co., Ltd. | Actuator used with an optical pickup |
US7219359B2 (en) * | 2001-12-01 | 2007-05-15 | Samsung Electronics Co., Ltd. | Actuator used with an optical pickup |
CN110678803A (en) * | 2017-05-26 | 2020-01-10 | Lg伊诺特有限公司 | Lens driving device, and camera module and optical apparatus including the same |
US11561362B2 (en) | 2017-05-26 | 2023-01-24 | Lg Innotek Co., Ltd. | Lens driving device, and camera module and optical device including same |
Also Published As
Publication number | Publication date |
---|---|
KR910001634B1 (en) | 1991-03-16 |
KR870011489A (en) | 1987-12-23 |
BR8702669A (en) | 1988-02-23 |
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Legal Events
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AS | Assignment |
Owner name: MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD., 1006, OA Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNORS:NAKAMURA, HIROYUKI;ITO, MASASHI;ITOI, TOSHIKI;AND OTHERS;REEL/FRAME:004736/0126 Effective date: 19870528 |
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